Inweldingwithoutinterlayersthe defectiveness of the joint zone is reduced with increase of welding temperature. However, even atТw = 1200 °С a string of oxides and pores in the joint zone is preserved.

Cu, Co, Ni interlayers were used for activation of diffusion processes. Application of interlayers with Co leads to formation of chemical inhomogeneity in the joint zone and development of considerable porosity in the butt. Application of Ni interlayers leads to formation of a zone with a low chromium content in the butt zone. Microstructure of this zone is similar to that of the initial alloy, but is less defective. Welding with Cu interlayer ensures a uniform nature of distribution of elements in the butt and minimum number of defects.